[INFO] cloning repository swuecho/play_json_rust
[INFO] running `"git" "clone" "--bare" "git://github.com/swuecho/play_json_rust.git" "work/cache/sources/gh/swuecho/play_json_rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/swuecho/play_json_rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/swuecho/play_json_rust" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/swuecho/play_json_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/swuecho/play_json_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/swuecho/play_json_rust" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/swuecho/play_json_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/swuecho/play_json_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1229fa085e3bcdd8c55ddac450be93796268d92e
[INFO] sha for GitHub repo swuecho/play_json_rust: 1229fa085e3bcdd8c55ddac450be93796268d92e
[INFO] validating manifest of swuecho/play_json_rust on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of swuecho/play_json_rust on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing swuecho/play_json_rust
[INFO] finished frobbing swuecho/play_json_rust
[INFO] frobbed toml for swuecho/play_json_rust written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/swuecho/play_json_rust/Cargo.toml
[INFO] started frobbing swuecho/play_json_rust
[INFO] finished frobbing swuecho/play_json_rust
[INFO] frobbed toml for swuecho/play_json_rust written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/swuecho/play_json_rust/Cargo.toml
[INFO] crate swuecho/play_json_rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/swuecho/play_json_rust/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing swuecho/play_json_rust against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-0/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/swuecho/play_json_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] f7ac6e2db5f2893dfac58fb3a5a73ae5c109be418f231d122f84025b063380cd
[INFO] running `"docker" "start" "-a" "f7ac6e2db5f2893dfac58fb3a5a73ae5c109be418f231d122f84025b063380cd"`
[INFO] [stderr]    Compiling play_json v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved imports `serde::json`, `serde::json`
[INFO] [stderr]  --> src/main.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 | use serde::json::{self, Value};
[INFO] [stderr]   |            ^^^^   ^^^^ no `json` in the root
[INFO] [stderr]   |            |
[INFO] [stderr]   |            could not find `json` in `serde`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `play_json`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f7ac6e2db5f2893dfac58fb3a5a73ae5c109be418f231d122f84025b063380cd"`
[INFO] running `"docker" "rm" "-f" "f7ac6e2db5f2893dfac58fb3a5a73ae5c109be418f231d122f84025b063380cd"`
[INFO] [stdout] f7ac6e2db5f2893dfac58fb3a5a73ae5c109be418f231d122f84025b063380cd